Realizing a ferroelectric state and high pyroelectric performance in antiferroelectric-oxide composites

2020 ◽  
Vol 49 (28) ◽  
pp. 9728-9734
Author(s):  
Ling Li ◽  
Di Fang ◽  
Rui-Xue Wang ◽  
Meng Shen ◽  
Haibo Zhang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Internal Strain ◽  
Ferroelectric State ◽  
Oxide Composites

We report a robust room temperature ferroelectric (FE) state in (1 − x)Pb0.99Nb0.02[(Zr0.57Sn0.43)0.933Ti0.067]0.98O3–xZnO ((1 − x)PNZST–xZnO) composites, where PNZST shows a predominant antiferroelectric (AFE) nature due to ZnO-induced internal strain.

scholarly journals A novel gas sensor based on porous α-Ni(OH)2 ultrathin nanosheet/reduced graphene oxide composites for room temperature detection of NOx

2016 ◽  
Vol 40 (5) ◽  
pp. 4678-4686 ◽  
Author(s):  
Ying Yang ◽  
Hongjie Wang ◽  
Linlin Wang ◽  
Yunlong Ge ◽  
Kan Kan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Response Time ◽  
Reduced Graphene Oxide ◽  
Gas Sensor ◽  
Room Temperature ◽  
Temperature Detection ◽  
Reduced Graphene ◽  
Ultrathin Nanosheet ◽  
Oxide Composites

Porous α-Ni(OH)2 TNS/rGO composites have a sensitivity of 64.4% and a response time of 10.0 s to 97.0 ppm NOx.

Stable Ni Nanoparticle–Reduced Graphene Oxide Composites for the Reduction of Highly Toxic Aqueous Cr(VI) at Room Temperature

Langmuir ◽  
2014 ◽  
Vol 30 (11) ◽  
pp. 3209-3216 ◽  
Author(s):  
Koushik Bhowmik ◽  
Arnab Mukherjee ◽  
Manish Kr Mishra ◽  
Goutam De
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Room Temperature ◽  
Reduced Graphene ◽  
Oxide Composites

Facile Synthesis of Cu/Cu2O Nanoparticles–Graphene Composites for Efficient Detection of NO2 at Room Temperature

NANO ◽  
2016 ◽  
Vol 11 (09) ◽  
pp. 1650102 ◽  
Author(s):  
Xin Liu ◽  
Jianbo Sun
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Room Temperature ◽  
Fast Response ◽  
Efficient Detection ◽  
Reduced Graphene ◽  
Cu2o Nanoparticles ◽  
Oxide Composites ◽  
Facile Solvothermal Method

Cu/Cu2O nanoparticles-reduced graphene oxide composites (CuGCs) have been successfully prepared by a facile solvothermal method. The combined characterizations indicate the successful formation of CuGCs. The [Formula: see text] 3 nm Cu/Cu2O nanoparticles homogeneously in situ grow on reduced graphene oxide sheets. CuGCs-based gas sensors were investigated for detection of NO2 at room temperature. The CuGCs exhibited fast response behavior, relatively high response and could achieve a detection limit as low as 5[Formula: see text]ppm. Furthermore, sensing mechanism and the reason for enhancing sensing performance have also been discussed.

Room-temperature volatile organic compounds sensing based on WO3·0.33H2O, hexagonal-WO3, and their reduced graphene oxide composites

RSC Advances ◽  
2016 ◽  
Vol 6 (107) ◽  
pp. 105171-105179 ◽  
Author(s):  
T. M. Perfecto ◽  
C. A. Zito ◽  
D. P. Volanti
Keyword(s):  
Graphene Oxide ◽  
Volatile Organic Compounds ◽  
Relative Humidity ◽  
Reduced Graphene Oxide ◽  
Organic Compounds ◽  
Room Temperature ◽  
Reduced Graphene ◽  
Volatile Organic ◽  
P Type ◽  
Oxide Composites

The sensors based on WO3·0.33H2O, RGO-WO3·0.33H2O, h-WO3, and RGO-h-WO3 showed great VOCs sensing properties at room temperature and 55% relative humidity. The materials exhibited a p-type behavior. RGO improved the acetone sensing response.

Magnetoelectric Effect in Multiferroic Perovskite-Oxide Composites

2006 ◽  
Vol 45 ◽  
pp. 2514-2519 ◽  
Author(s):  
Manabu Gomi ◽  
K. Ban ◽  
Naoya Nishimura ◽  
Takeshi Yokota
Keyword(s):  
Room Temperature ◽  
Magnetoelectric Effect ◽  
Spontaneous Magnetization ◽  
Hole Concentration ◽  
Perovskite Oxide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Composites ◽  
Curie Temperatures ◽  
Magnetic Dielectric

Magnetic, dielectric properties and magnetoelectric effect of ceramics with a composition of 0.9 BaTiO3-0.1 LaMnO3 have been investigated. X-ray diffraction measurements showed that the sintered ceramics are composites containing a small amount of (La, Ba)MnO3 phase in the BaTiO3 matrix. These composites were multiferroic, having ferromagnetic and ferroelectric Curie temperatures of 330 K and 392 K respectively. We found that the composite sintered at 1150 °C exhibits a reduction of spontaneous magnetization as large as 55 % at room temperature when an electric field of 1.4 KV/mm is applied. This reduction is probably ascribed to a change of hole concentration distribution in the precipitated ferromagnetic (La, Ba)MnO3 and the resultant decrease of ferromagnetic Curie temperature.

Wet forming, sintering behavior, and dielectric properties of BaTi0.8Zr0.2O3

1996 ◽  
Vol 11 (12) ◽  
pp. 3071-3076 ◽  
Author(s):  
Yoshihiro Hirata ◽  
Takahiro Kawazoe
Keyword(s):  
Dielectric Properties ◽  
Room Temperature ◽  
Sintering Temperature ◽  
Lattice Parameter ◽  
Sintering Behavior ◽  
Ferroelectric State ◽  
Uniform Microstructure ◽  
Higher Temperature ◽  
Lower Temperature ◽  
Diffuse Phase

Density, grain size, lattice parameter, and dielectric properties were measured on BaTi0.8Zr0.2O3 sintered at 1100–1600 °C. The hydrothermally prepared BaTi0.8Zr0.2O3 particles of 128 nm diameter were consolidated by filtration of 2-methoxyethanol suspensions and subsequently compressed by isostatic pressing under a pressure of 294 MPa to form a uniform microstructure of high density (52% of the theoretical density). These green compacts were sintered to a relative density of above 99% in the temperature range from 1350 to 1600 °C where rapid grain growth to above 30 μm occurred. Increase of sintering temperature was accompanied by the increase of lattice parameter and dielectric constant of BaTi0.8Zr0.2O3 at room temperature. The sintered BaTi0.8Zr0.2O3 showed a diffuse phase transition from paraelectric (higher temperature) to ferroelectric state (lower temperature) at 32 °C.

scholarly journals Tunability modeling and experiments for BaTiO3-based solid solutions

2007 ◽  
Vol 1 (1-2) ◽  
pp. 23-27 ◽  
Author(s):  
Lavinia-Petronela Curecheriu
Keyword(s):  
Phase Transition ◽  
Dielectric Constant ◽  
Room Temperature ◽  
Ferroelectric State ◽  
Electric Field Dependence ◽  
Para Phase ◽  
Dipolar Moment ◽  
Modeling And Experiments ◽  
Paraelectric State ◽  
Double Well Potential

In this paper, the electric field dependence of the dielectric constant in some BaTiO3-based ferroelectrics is theoretically described by means of the Landau-Ginzburg-Devonshire (LGD) theory and its? approximations valid for low polarizations (Johnson?s equation and even-power relation) when the sample is in its ferroelectric state and by a model considering random non-interacting dipolar units in a double well potential for the paraelectric state. High-voltage tunability data were obtained at room temperature for BaZr0.10Ti0.90O3 and Ba0.70Sr0.30TiO3 ceramics. The data were well fitted by using the Johnson?s approximation for the ferroelectric-relaxor BaZr0.10Ti0.90 O3 and satisfactory for the Ba0.70Sr0.30TiO3 ceramics, close to its ferro-para phase transition. For the last one, the non-interacting dipolar units model allows to determine the average dipolar moment.

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